Figure 5
From: Response to Dengue virus infections altered by cytokine-like substances from mosquito cell cultures
Photomicrographs showing removal of apoptosis induction activity by proteinase K treatment. A = Untreated, cells persistently infected with DEN-2 (cf Fig. 3A); B = Positive immunofluorescence for apoptosis marker (green) in cells persistently infected with DEN-2 and exposed to untreated 5 kDa filtrate from C6/36 cells acutely-infected with DEN-2; C = As in B, but with proteinase-K treatment and showing little positive fluorescence (green) for the apoptosis marker.